The idea of preservation is to make the data easier
to read/interpret/archive, not to keep the problem at the same level.
This is a very important point - if you are archiving disks for
historical reasons, you have to realize that like the original systems,
the tools you are using now will eventually become difficult if not
impossible to use on future "modern" hardware. It then becomes
critical to be able to recover the data by other means.
Another big reason to use a documented format is that you may
want/need to do other things with the data besides write it back to
original format disks ... the original system may not be available
or working. It may not have the means to transfer data other than
by reading it's floppies. You may be trying to extract files from the
disk, or run it under emulation. To do these things, you need to be
able to access the data directly from the image file, and to fully
understand how that data is organized.
Also, don't assume it will be "the same level" - It may be "worse
level"
It may be easier to read data from the original documented-format
disks than to reverse engineer the closed proprietary image file.
This becomes a major issue when all you have left is the image file.
This is why I specifically documented and placed the ImageDisk
file format into the public domain. The ability to do this was one of
my primary motivations in creating the program. Nobody owns the
format, and nobody can ever restrict what you do with it. I strongly
urge anyone who is creating other disk/data imaging systems to
do the same.
--
dave12 (at) Dave Dunfield
dunfield Firmware development services & tools:
www.dunfield.com
(dot) com Classic computers:
http://www.classiccmp.org/dunfield/